1 Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, (CLB), USA.
2 From the Department of Health Policy and Management, Harvard T. H. Chan School of Public Health (MLB) in Boston, MA, USA; Division of General Internal Medicine and Primary Care, Department of Medicine, Brigham and Women's Hospital (MLB) in Boston, MA, USA. Electronic address: mbarnett@hsph.harvard.edu.